What Is Marketplace API Integration?
Marketplace API integration is the connection that automatically exchanges product, stock, price and order data between your system and the marketplace. It eliminates manual upload and update work.
Which work does integration take over?
There are four core flows: product transfer, stock and price updates, order retrieval, and shipping and status notifications. When all four are done by hand, they are both slow and error-prone.
The real gain of integration is not speed but consistency. A single product forgotten during a manual update leads to selling without stock or at the wrong price; in an automated flow this risk becomes a rule.
Integration is not an analysis tool
A common confusion: integration moves your data to the platform, while an analysis tool brings the publicly available data on the platform to you. They run in opposite directions and do not replace each other.
When buying, clarify this. If you want to see competitor prices, integration is not useful to you; if you want stock synchronization, an analysis tool is not useful to you.
How to do it step by step?
1. Define your primary data source
Which system holds the correct product and stock information? An integration set up without a single defined source leads to systems overwriting each other.
2. Prepare mandatory fields completely
Marketplaces require mandatory attributes per category. A missing field is the most common reason for a transfer being rejected.
3. Run a trial first
Before the actual transfer, use a dry run to see which products will produce errors. If this step is skipped, thousands of faulty records can be created.
4. Don't resend unchanged items
Sending the entire catalog each time consumes API quota and creates unnecessary load. Only changed records should be sent.
5. Tie the error report to a routine
An integration can silently run partially. If the error list is not read, problems are noticed months later.
Integration flows
| Flow | Direction | Critical point |
|---|---|---|
| Product transfer | You → marketplace | Mandatory category attributes |
| Stock update | You → marketplace | Delay and safety margin |
| Price update | You → marketplace | Conflict with campaign commitments |
| Order retrieval | Marketplace → you | Avoiding duplicate records |
| Shipping notification | You → marketplace | Timely notification, performance impact |
Common mistakes
1. Transferring without a dry run. Thousands of faulty records are created and cleaning them takes days.
2. Leaving mandatory fields incomplete. The transfer is rejected; the product never goes live.
3. Sending the entire catalog each time. API quota runs out and updates get delayed.
4. Connecting two systems in both directions. The systems overwrite each other; stock and price keep fluctuating.
Limitations: what does it not cover?
Applying these with awareness lets you set realistic expectations:
API quotas exist. Marketplaces limit the number of requests; updating infinitely often is not possible.
Every platform is different. Field names, requirements and rules vary from platform to platform; a single integration does not fit everywhere.
Source data quality is decisive. Incomplete or incorrect product data is not fixed by integration; it is carried over as is.
Integration does not bring competitor data. For the externally visible price and ranking side of the market, a separate analysis tool is needed.
Frequently asked questions
What is marketplace API integration?
The connection that automatically exchanges product, stock, price and order data between your system and the marketplace.
What work does it automate?
Product transfer, stock and price updates, order retrieval, shipping and status notifications.
Is integration the same as an analysis tool?
No. Integration moves your data to the platform; an analysis tool brings the publicly available data on the platform to you.
Why is a transfer rejected?
The most common reason is missing mandatory attributes for the category. A dry run shows these errors in advance.
Does a small seller need integration?
If the product count is small, manual management is possible. As the catalog grows and the number of channels increases, manual updates start producing errors.
Doing it with the tool
For product transfer from a supplier's XML to Trendyol, XML Manager processes the feed, maps mandatory attributes, shows errors in advance with a dry run, and does not resend unchanged records. Currently the Trendyol Product V2 API is supported.
For the externally visible side of the market, Hermes, for ranking tracking, SeoScope is used.
Last updated: September 10, 2026